MultiTrode MultiSmart Installation & Operation Manual page 102

14.8.5 DuoProbe Level Sensor Configuration
Similar to the normal MultiTrode probe, a DuoProbe is comprised of ten (10) conductive sensors, with the
addition of a pressure transducer located at the end of the probe. (As for the standard probe, more than one
DuoProbe can be configured for a system, e.g. 2 wells, or a DuoProbe in primary and backup configuration).
For calibration purposes, a second pressure transducer is present in the MultiSmart to sense ground level
atmospheric pressure. The calibration process takes into account, the pressure reading from the DuoProbe
and the atmospheric pressure measured by the sensor in the MultiSmart.
re-calibration occurs when either of the following conditions are met; the level rises over the 10
(from the bottom) or the total level rise equals 40% of the probe length. The recalibration process is inhibited
when two or more sensors are uncovered faster than a preset time, e.g. if the probe is manually raised too
fast. (The relevant parameter is the Level Change Time and has a default of 5s). The recalibration process
is re-enabled when two or more sensors are uncovered slower than the preset time.
There are hardware and firmware requirements which must be satisfied before the DuoProbe can be used as
the level device on a MultiSmart.
Build Version - firmware installed must be version 2.20 or higher
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HW Version – the processor board must be version PCB40001r01 or higher
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To confirm the versions are correct, navigate to:
14.8.5.1 DuoProbe Placement – IMPORTANT Considerations
While the DuoProbe is capable of measuring the full depth of the well, MultiTrode recommends that the
probe is positioned such that the pumps operating range is within the probe range, i.e. the pump(s) activation
setpoint is below the top most sensor of the probe. See Figure 108. This best utilises the redundancy
feature of the DuoProbe should the analog pressure transducer fail.
Figure 108 – DuoProbe Positioned Within Operating Range of the Pump(s)
If the DuoProbe is positioned such that the activation setpoint is above the highest probe sensor then at least
one of the following safeguards should be implemented.
Monitor via SCADA the Duo-probe 1 Error and treat it as a serious fault. (This fault is displayed if the
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difference between the pressure sensor and the probe exceeds pre-defined limits).
Configure the Level Locked feature and monitor it via SCADA and treat it as a serious alarm. (See
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Section 14.8.11 for setup procedure.).
Install a backup level sensor. (See Section 14.8.8).
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WARNING: If the pumps operating range is outside the probe range and the pressure sensor fails, the
level will appear to lock at the level of the highest probe sensor (below the activation setpoint),
meanwhile the Well will continue to fill and if no safeguard or backup level device is installed, a spill will
result if the DuoProbe fault is not rectified.
Page 102 of 201
MultiSmart Installation & Operation Manual
and verify the Build and HW Versions.
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The operating range of the pump falls within the 10
sensor probe. Should the analog pressure sensor fail,
the setpoints will shift slightly so that they coincide with
the probe sensor immediately above for the activation
point and the probe sensor immediately below for the
deactivation point.
To maintain accuracy, a
MultiSmart_IO_Manual_A4_v2-22_R15.doc
th
sensor